No, he’s a fictional character.
When people play first-person shooters, they aren’t killing people, they’re playing a game. Consumption of media containing violence then causing real-world violence/ill behavior has been repeatedly disproven for years and years and years; if it was true, it wouldn’t still be getting inconclusive studies, even while the only people left running the studies are extremely biased.
The actual problem is the outliers of people that don’t have internal boundaries to separate fictional interest from reality, but the number of wrongdoers where that is the reasoning behind their actions (instead of anything else) is so so astronomically low. The real causes of destructive and violent behaviors are a million external factors in the person’s life (school, work, home life, relationships, social treatment, etc) and the person’s internal factors that they can’t control which would require medical advice/assistance through therapy/medication (which most either can’t afford or don’t seek out/believe they need). If media was the only cause of bad behavior and vile thinking, I want to know what f/o’s, video games, and series all of the dictators of history were into, and how any good people of history didn’t ever like conflict/bad guys in fiction.
“Disney Villains” are an extremely valuable market to Disney; it has an incredibly wide reach with so many people that love them. Disney’s movies have been doing so poorly recently that they literally released a Disney Villain video game just a bit ago, because they know so many people will see the characters they love and want to get in on it. I’m pretty sure people that like those villains aren’t trying to kill off the protagonists in their own lives to rule the world with an iron fist. That’s a bit ridiculous to suggest.
You can like something in fiction and not try to recreate/idolize it in the real world like everyone else. Media you spend time with doesn’t have complete control over literally everything you think/feel like you’re a ball of play-doh. That’s the 3rd grade school-yard thought process of, “I’m a boy, but if I hang out with girls, I’m gonna turn into a girl!”
Also, it’s pretty stupid to try to argue whether something is canon or not in fnaf, the series where basically nothing is ever confirmed. We literally don’t have a single example in the games of how William behaved or spoke when with his family. People headcanon it all different ways and are pretty ignorant to suggest that only one way could ever be right. If you want to try to bring in the books or something, those are just effectively a “canonized au with an official stamp” that a majority of the fanbase ignores a lot of, if not all of.
When there are disgusting people out here obsessing over/defending actual murderers, you can have an issue. If you’re picturing everyone with a villainous-character interest as Ashley Trevino, you’re the one with profiling problems.